I have read thru the stickies, etc here but with the new cards out I still have a couple questions. I currently have 2 nvidia gefore 8600 gt graphics cards sli and I want to upgrade. Newer games are not able to perform at high end, such as Empire total war. My system is a 2.4 ghz quad core Q6600 w/ 3gb ram, liquid cooled, PSU is COOLER MASTER eXtreme Power RP600PCAR 600W running Vista. My resolution is 1680 X 1050. I have a eVGA nForce 780i SLI 775 A1 Motherboard. I am looking at a couple diff options, whether it would be best to get the radeon 4890, 4870 x2, or the geforce gtx 275, or if one of their other models would be better. Also how do I tell if a card I like will work with mobo etc?I've read the reviews and Im still torn, I wanna get the best deal for my dollar of course. I'd like to not upgrade my PSU if possible, but if you think it's needed what do you recommend as replacement? So basically if you were spending around $300ish what would you do? Thanks for the help!